Multi-stage emission system for large displacement compression ignition non-road diesel generator systems for emergency and non-emergency stationary power applications

A two-stage emissions treatment system combining in-cylinder EGR with low-temperature aqueous ammonia SCR addresses high NOx emissions in large-displacement engines, allowing for expanded generator installations and improved grid support.

WO2026117298A1PCT designated stage Publication Date: 2026-06-04BLUEFIN ESI INC
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BLUEFIN ESI INC
Filing Date
2025-09-11
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Conventional large-displacement diesel engines emit nitrogen oxides at levels that exceed sitewide emissions limits, restricting the number of generators that can be installed in emissions-constrained regions, and existing systems fail to effectively combine medium-speed engines with SCR technology to meet stringent regulatory thresholds.

Method used

A two-stage emissions treatment system integrating onboard in-cylinder Exhaust Gas Recirculation (EGR) with a low-temperature Selective Catalytic Reduction (SCR) using aqueous ammonia, eliminating the need for DOC and DPF, and achieving ultra-low NOx emissions suitable for both emergency and non-emergency applications.

Benefits of technology

Enables larger installations of medium-speed generators within strict emissions caps, supports grid stability, and maintains compliance during dynamic load fluctuations, reducing uncontrolled emissions and extending SCR catalyst life.

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Abstract

A multi-stage emissions treatment system is disclosed for non-road, medium-speed, large-displacement diesel generator applications. The system integrates an onboard in-cylinder exhaust gas recirculation system with a downstream low temperature selective catalytic reduction unit (32) that utilizes aqueous ammonia as a reductant agent. The combination enables ultra-low nitrogen oxide (NOX) emissions performance at exhaust temperatures below those required for urea-based SCR systems. The engine (24), such as Wabtec's 250 series, operates at medium speeds (300-1,200 RPM) and supports both emergency and non-emergency use cases, including compliance with EPA Tier 4 Final standards. The system provides inducement resilience by maintaining EPA Tier 4 compliance in the event of SCR failure. High torque and inertia characteristics allow the generator (34) to effectively respond to transient loads typical of artificial intelligence workloads. The invention enables the first viable use of medium-speed, large-displacement diesel engines (24) in emissions-constrained, multi-engine stationary power sites such as data centers.
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